Aspen is family owned and has been building spas in St. Louis since 1991. Two brothers started it and still run it, out of a factory with its own showroom attached. St. Louis is about five hours up the road, which matters more than it sounds. When a part is needed, the people who built the thing are in the same time zone as the people who sold it to you.
The design idea they lead with is that one seat can't suit every body, so the seats inside a single spa sit at different heights with different jet patterns. That's why two models with the same footprint can feel completely different once you're in them, and it's why we'd rather you came and sat in a few than picked one off this page.